Design of aircraft on‐glass antennas for FM radio communications

Abstract

isolations greater that 35 dB and 49 dB, respectively, have been achieved in simulation. Simulated VSWR at all ports are better than 2.0. The measured conversion loss is 6-8 dB for þ10 dBm LO power in whole RF band. The measured LO-IF and LO-RF isolations are greater than 40 dB and 45 dB, respectively. Simulated and measured conversion losses are shown in Figure 4. The agreement of the simulated and measured results is fairly good. Table 2 summarizes the simulated and measured results. The fabricated prototype mixer shown in Figure 5, used for demonstration of the design, was precision machined from aluminum and measures 30 Â 25 Â 22 mm 3 . CONCLUSIONSA broadband single balanced waveguide mixer at K-band has been developed. The mixer configuration is of crossbar type and is implemented in suspended stripline circuit integrated with RF and LO waveguides. The mixer has wide IF bandwidth with fixed LO frequency. The Mixer has been simulated, fabricated, and measured. Simulation and measured results agrees well. The measured conversion loss across the whole band is 6-8 dB, and LO-IF and LO-RF port isolations are greater than 40 dB and 45 dB, respectively. This mixer design approach can also be applied to design broadband mixer at higher frequency bands. This mixer will be used in broadband communication systems. ACKNOWLEDGMENTS